Docs: Fix a misplaced statement in the document for ServerProxy (pythonGH-130616)

The sentence "If an HTTPS URL ..." explains what the parameter means,
so moved it to the paragraph explaining what the other parameters mean.

Author: Yuki Kobayashi

Doc/library/xmlrpc.client.rst

@@ -61,6 +61,8 @@ between conformable Python objects and XML on the wire.
    The *headers* parameter is an optional sequence of HTTP headers to send with
    each request, expressed as a sequence of 2-tuples representing the header
    name and value. (e.g. ``[('Header-Name', 'value')]``).
+   If an HTTPS URL is provided, *context* may be :class:`ssl.SSLContext`
+   and configures the SSL settings of the underlying HTTPS connection.
    The obsolete *use_datetime* flag is similar to *use_builtin_types* but it
    applies only to date/time values.
 
@@ -75,9 +77,7 @@ between conformable Python objects and XML on the wire.
    portion will be base64-encoded as an HTTP 'Authorization' header, and sent to
    the remote server as part of the connection process when invoking an XML-RPC
    method.  You only need to use this if the remote server requires a Basic
-   Authentication user and password. If an HTTPS URL is provided, *context* may
-   be :class:`ssl.SSLContext` and configures the SSL settings of the underlying
-   HTTPS connection.
+   Authentication user and password.
 
    The returned instance is a proxy object with methods that can be used to invoke
    corresponding RPC calls on the remote server.  If the remote server supports the